| 1. | The research of speed sensorless asynchronous machine vector control system based on the model reference adaptive neural network
基于模型参考神经网络自适应异步电机无速度传感器矢量控制系统的研究 |
| 2. | Lots of wind turbines are asynchronous machines , moreover , wind energy both has it ' s own randomicity and is affected by the seasons
风力发电机大部分采用的是异步发电机，况且风能也有随机性，受季节影响的特点。 |
| 3. | The mc controlled by this strategy not only achieves the dtc of asynchronous machine with excellent dynamic performance but also acquires good input currents and an adjustable power factor
按这种策略进行控制的矩阵式变换器，既可实现对异步电机进行动态性能优良的直接转矩控制，又可获得良好的输入电流波形以及可调的功率因数。 |
| 4. | Firstly , according to the mathematical model of asynchronous machines and the principle of direct torque control , the theoretical and experimental analysis about hexagon and round track of flux is proposed in the paper
首先，本文的研究是从异步电动机的数学模型出发，然后根据传统直接转矩的控制原理，对于定子磁链的不同轨迹，分别进行了六边形和圆形磁链的理论和实验分析。 |
| 5. | The principle of ac - dc - ac locomotive is that transformer transforms the high single - phase ac voltage from contact system to lower ac voltage first , then rectifier transforms this ac voltage to steady dc voltage , finally converter transforms this dc voltage to three - phase vfvv ac voltage as the voltage source for asynchronous machine
交?直?交型电力机车系统的原理是：先将从接触网获得的单相交流高电压经变压器降压后，再经整流器变换为平稳的直流电压，直流电压经逆变器变换为三相交流电压，供给机车轮对上的牵引电机。 |
| 6. | The main contents of the study as follows : ( 1 ) an introduction to the space vector theory and its application on the modeling of pmsm is presented firstly , which shows the basic idea of pmsm dtc . a comparison of dtc in asynchronous machine and pmsm is made as well . in order to take the full advantage of the dtc , the pmsm has to be properly selected
本文的主要内容包括： ( 1 )由空间矢量模型推导出永磁同步电机的磁链、电压和转矩的公式，描述了永磁同步电机转矩直接控制的基本控制机理，分析了永磁同步电机与感应电机在转矩直接控制方式上的不同之处以及转矩直接控制对永磁同步电机的要求。 |
| 7. | Although dtc was initially applied in asynchronous machines , but it has been introduced successfully to synchronous machines . this thesis will discuss the dtc in the pmsm . based on widely reading of references and understanding of pmsm operational principle , the thesis analyzes the principle of pmsm dtc and proposes the pmsm dtc strategy
本文通过大量的文献资料阅读，对永磁同步电机及其相关技术的发展、现状和趋势有了一个比较全面的理解，在此基础上，详细分析了永磁同步电机转矩直接控制的机理，并提出了一套相应的转矩直接控制方案，建立了仿真和试验平台，进行了仿真分析和实验研究，获得了有价值的研究成果。 |
